Corrosionpedia explains Electrical Steel

Electrical steel is a type of iron alloy that contains 0-6.5 percent silicon. The standard commercial alloy can have a maximum silicon content of 3.2 percent since any concentration level higher than this could promote brittleness during the cold rolling process.

Electrical steels are available in various forms, the most common being:

The component silicon greatly enhances the steel's resistivity. At the same time, it helps in reducing hysteresis loops and eddy currents of materials, leading to decreased core loss. Yet it also embrittles and hardens the metal, which affects its workability.

Electrical steels have an essential role in terms of production, conduction and allocation of electrical power. In fact, it is one of the most valuable magnetic materials available today.